Omit the class description when the group block shows one class

The Group Classes block can be pinned to a single class via its Class
option so it can be embedded on a page dedicated to that class. On such a
page the surrounding copy already describes the class, so the card
repeated it. In single-class mode the description is now left out and the
card shows only the schedule, instructor, schedule note, price, enrolment
deadline and the enrol/withdraw controls.

The editor preview follows the same rule: BlockPreview::groupClasses()
takes the mode from the block's offeringId attribute, drops the sample
description when a class is pinned, and notes what the published page
shows. Its sample card also gained the .us-class-when and
.us-enrol-deadline elements the live markup has always rendered.

Co-Authored-By: Claude Opus 5 <[email protected]>

docs/features/editor-blocks.md

@@ -30,7 +30,7 @@ Four blocks have sidebar (inspector) options:
 | `us-scheduler/student-login` | `bookingPageId` (number) | `0` | Page the "View available lessons" link points to for logged-in visitors, and the post-login redirect target. `0` = the current page. |
 | `us-scheduler/student-login` | `autoRedirect` (boolean) | `false` | Send logged-in visitors straight to the booking page instead of showing the link. Does nothing until a booking page is chosen. |
 | `us-scheduler/student-register` | `loginPageId` (number) | `0` | Page the "Sign in to your account" link points to after a student confirms their email. `0` = the WordPress login screen. Shortcode equivalent: `[us_student_register login_page_id="…"]`. |
-| `us-scheduler/group-classes` | `offeringId` (number) | `0` | Restrict the page to a single group class, for embedding on a page dedicated to that class. `0` = browse all classes. Shortcode equivalent: `[us_group_classes offering="…"]`. |
+| `us-scheduler/group-classes` | `offeringId` (number) | `0` | Restrict the page to a single group class, for embedding on a page dedicated to that class. The class description is then omitted — only the schedule, instructor, price and enrolment controls are shown, so the surrounding page's own copy is not repeated. `0` = browse all classes, descriptions included. Shortcode equivalent: `[us_group_classes offering="…"]`. |
 
 The page selects list all published pages; if a chosen page is later deleted,
 the blocks fall back to their defaults. The group-classes block's class
@@ -78,7 +78,9 @@ placeholder content:
 - **Booking** — `#us-booking-app` with sample `.us-day` / `.us-slot` rows and
   disabled Book buttons.
 - **Group classes** — `#us-group-app` with a sample `.us-class` card and a
-  disabled Enrol button.
+  disabled Enrol button. When `offeringId` pins a single class the preview
+  drops the sample description, matching what the live page renders in that
+  mode.
 - **Login** — the real `templates/frontend/login-page.php` template (it has
   no request-state dependencies).
 - **Registration** — a disabled sample of the `.us-register-form` fields.

docs/features/group-classes.md

@@ -176,7 +176,7 @@ class becomes enrollable for them — they choose whether to enrol.
 - Model: `Unsupervised\Schedular\GroupClass\Enrollment`
 - Admin controller: `Unsupervised\Schedular\GroupClass\GroupClassController` — `renderPage` (studio admin per-class summary, `view_all_lessons`) and `renderInstructorPage` (instructor summary + `?class_id` roster detail, `view_own_lessons`)
 - REST endpoint: `Unsupervised\Schedular\GroupClass\EnrollmentEndpoint`
-- Frontend: `Unsupervised\Schedular\GroupClass\GroupClassPage` (`[us_group_classes]` shortcode; `offering="…"` restricts it to a single class for embedding on a dedicated page — the block equivalent is the `offeringId` attribute)
+- Frontend: `Unsupervised\Schedular\GroupClass\GroupClassPage` (`[us_group_classes]` shortcode; `offering="…"` restricts it to a single class for embedding on a dedicated page — the block equivalent is the `offeringId` attribute). In single-class mode `assets/js/group-classes.js` leaves the class description out of the card, since the page it is embedded on already describes the class; the schedule, instructor, schedule note, price and enrolment controls are still shown.
 - Reuses `Registration\RegistrationGate` (intake answers + booking-scoped policy acceptance, type `enrollment`)
 
 > **Payment:** a priced enrolment creates a payment via `Payment\PaymentService`